MK2727 Low Cost 27 MHz VCXO Description Features The MK2727 is MicroClock’s lowest cost, low jitter, high performance VCXO and PLL clock synthesizer designed to replace expensive 27MHz VCXOs. The on-chip Voltage Controlled Crystal Oscillator accepts a 0 to 3V input voltage to cause the output clocks to vary by ±100 ppm. Using MicroClock’s patented VCXO and analog PhaseLocked Loop (PLL) techniques, the device uses an inexpensive external 13.5 MHz pullable crystal input to produce a 27 MHz output clock. • Packaged in 8 pin narrow SOIC • Uses an inexpensive 13.500 MHz external crystal • On-chip VCXO (patented) with pull range of 200ppm (minimum) • VCXO tuning voltage of 0 to 3V • 25mA output drive capability at TTL levels • Advanced, low power, sub-micron CMOS process • 5V operating voltage MicroClock manufactures the largest variety of Set-Top Box and multimedia clock synthesizers for all applications. If more clock outputs are needed, see the MK2731 or MK277x family of parts. Consult MicroClock to eliminate VCXOs, crystals and oscillators from your board. Block Diagram VIN X1 13.5 MHz pullable crystal X2 Voltage Controlled Crystal Oscillator PLL/Clock Synthesis Circuitry Output Buffer 27MHz 1 Revision 111600 Printed 11/16/00 Integrated Circuit Systems, Inc.•525 Race Street•San Jose•CA•95126•(408)295-9800tel•www.icst.com MDS 2727 B MK2727 Low Cost 27 MHz VCXO Pin Assignment MK2727 X1 1 8 X2 VDD 2 7 GND VIN 3 6 VDD GND 4 5 CLK 8 pin (150 mil) SOIC Pin Descriptions Number 1 2 3 4 5 6 7 8 Name X1 VDD VIN GND CLK VDD GND X2 Description Crystal connection. Connect to a pullable 13.5 MHz crystal. VDD. Connect to +5V. Voltage input to VCXO. Zero to 3V analog input which controls the frequency of the VCXO. Connect to ground. 27 MHz clock output. VDD. Connect to +5V. Connect to ground. Crystal connection. Connect to a pullable 13.5 MHz crystal. 2 Revision 111600 Printed 11/16/00 Integrated Circuit Systems, Inc.•525 Race Street•San Jose•CA•95126•(408)295-9800tel•www.icst.com MDS 2727 B MK2727 Low Cost 27 MHz VCXO Electrical Specifications Parameter Conditions Minimum Typical Maximum Units 7 VDD+0.5 70 260 150 V V °C °C °C 5.25 V V V V mA mA V ABSOLUTE MAXIMUM RATINGS (note 1) Supply voltage, VDD Inputs and Clock Outputs Ambient Operating Temperature Soldering Temperature Storage temperature Referenced to GND Referenced to GND -0.5 0 Max of 10 seconds -65 DC CHARACTERISTICS (VDD = 5.0V unless noted) Operating Voltage, VDD Output High Voltage, VOH Output Low Voltage, VOL Output High Voltage, VOH, CMOS level Operating Supply Current, IDD Short Circuit Current VIN, VCXO control voltage IOH=-25mA IOL=25mA IOH=-8mA No Load 4.75 2.4 0.4 VDD-0.4 20 ±100 0 3 AC CHARACTERISTICS (VDD = 5.0V unless noted) Input Crystal Frequency Input Crystal Accuracy Output Clock Rise Time Output Clock Fall Time Output Clock Duty Cycle Maximum Absolute Jitter, short term 27 MHz output pullability, note 2 Notes: 13.50000 0.8 to 2.0V 2.0 to 0.8V At 1.4V 0V ≤ VIN ≤ 3V 40 ±100 50 200 ±30 1.5 1.5 60 MHz ppm ns ns % ps ppm 1. Stresses beyond those listed under Absolute Maximum Ratings could cause permanent damage to the device. Prolonged exposure to levels above the operating limits but below the Absolute Maximums may affect device reliability. 2. With a MicroClock approved pullable crystal. External Components The MK2727 requires a minimum number of external components for proper operation. A decoupling capacitor of 0.1µF should be connected between VDD and GND on pins 2 and 4, as close to the MK2727 as possible. A series termination resistor of 33Ω may be used for the clock output. The input crystal must be connected as close to the chip as possible. The input crystal should be a parallel mode, pullable, AT cut, 13.5MHz, with 14pF load capacitance. Consult MicroClock for recommended suppliers. IMPORTANT read application note MAN05 before laying out the PCB. 3 Revision 111600 Printed 11/16/00 Integrated Circuit Systems, Inc.•525 Race Street•San Jose•CA•95126•(408)295-9800tel•www.icst.com MDS 2727 B MK2727 Low Cost 27 MHz VCXO Package Outline and Package Dimensions 8 pin SOIC E Symbol A b D E H e h Q H Pin 1 h x 45° D Inches Min Max 0.055 0.068 0.013 0.019 0.185 0.200 0.150 0.160 0.225 0.245 .050 BSC 0.015 0.004 0.01 Millimeters Min Max 1.397 1.7272 0.330 0.483 4.699 5.080 3.810 4.064 5.715 6.223 1.27 BSC 0.381 0.102 0.254 A Q c e b Ordering Information Part/Order Number MK2727S MK2727STR CHANGE HISTORY Version Date first published A 12/12/96 B 12/2/97 Marking MK2727S MK2727S Status Advance Released Shipping packaging tubes tape and reel Package 8 pin SOIC 8 pin SOIC Temperature 0-70°C 0-70°C Comments Original Updated logo & address. Corrected pkg height. While the information presented herein has been checked for both accuracy and reliability, MicroClock Incorporated assumes no responsibility for either its use or for the infringement of any patents or other rights of third parties, which would result from its use. No other circuits, patents, or licenses are implied. This product is intended for use in normal commercial applications. Any other applications such as those requiring extended temperature range, high reliability, or other extraordinary environmental requirements are not recommended without additional processing by MicroClock. MicroClock reserves the right to change any circuitry or specifications without notice. MicroClock does not authorize or warrant any MicroClock product for use in life support devices or critical medical instruments. 4 Revision 111600 Printed 11/16/00 Integrated Circuit Systems, Inc.•525 Race Street•San Jose•CA•95126•(408)295-9800tel•www.icst.com MDS 2727 B